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Answer

↓Steps Explained:↓

You multiplied 28 x 3.50 and got 98.

Is this reasonable?

Round 28 down:

20

Round 3.50 down:

3.00

Multiplying our estimates, we have:

20 x 3.00 = 60

Calculate the residual of 28

28 - 20 = 8

Multiply this by 3.00

8 * 3.00 = 24

Calculate the residual of 3.50

3.50 - 3.00 = 0.5

Multiply this by 20

0.5 * 20 = 10

Add our 2 residual products:

24 + 10 = 34

Add residual product to estimate:

60 + 34 = 94

Evaluate our estimate of 98.